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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69d677c376316f86fcd085149c430feafef25e99ad3d253cf3367833a3c5079' 
  AND token = 'RjV9FHG5qvTn9erxOSt53YQKXZ/s+EK9mgsMrWGNU48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}